Chapter Objectives

After reading this chapter, you should be able to identify the product features and system applications.

Introduction

The Bulletin 1402, Line Synchronization Module (LSM), is designed to meet the needs of manufacturers, 

system integrators, and users of 3 phase alternators and cogeneration systems or for applications that require 

two three–phase systems to be synchronized with each other. 

The module provides means for automatic synchronization, load sharing, and high speed power system monitoring.

General Description

The Line Synchronization Module (LSM) is a two slot 1771 form factor module that fits into a standard Allen–Bradley 1771 I/O chassis. 

It performs three functions:

1. Measures appropriate parameters from the two three–phase systems and provides control and 

error signals to implement engine governor control for synchronization.

2. Provides an analog output that is representative of the ratio of the power being supplied by the alternator to the output rating of the alternator, 

reads an analog input that represents the ratio of the total system load being supplied to the total system capacity, 

and provides an error signal to adjust the alternator for proper load sharing based on the instantaneous load requirements.

3. Performs as a multi–function digital power monitor for the system.

These functions provide data and control signals which are communicated to the PLC-5 via the 1771 backplane.